Note: User names are case-insensitive, all space and punctuation characters
are equivalent, no funny characters (umlauts, accents, etc.) allowed.
Likewise, the password should not contain funny characters to avoid browser trouble.
The email address will be used when you join a game hosted on planetscentral.com,
and it will be useful that I can contact you when there are problems.
Although it is optional, I strongly recommend you to enter a valid email address
(you will have to confirm that you actually own it before it is used for automated mailing).
It will not be used for advertisements etc., see terms of use.